Wikileaks: who is Bradley Manning ?

As ripples from the latest Wikileaks disclosure continue to be felt the world over, just who is Bradley Manning ... the young ex-US army private who's suspected of handing over the information.
Brazilian police move into Rio slums and seize control from the drug lords.
And a war of a different kind in Mexico City; authorities battle to turn what was once the world's most polluted city into a green paradise.